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Test ID FCUIP CU (Chronic Urticaria) Index Panel

Specimen Required

Patient preparation: Patients taking calcineurin inhibitors should stop medication 72 hours prior to draw. Patients taking prednisone should be off their medication for 2 weeks prior to draw.

Specimen Type: Serum

Container/Tube: Red or SST

Specimen Volume: 3 mL

Collection Instructions: Draw blood in Red-top tube (SST is acceptable). Separate from cells within 2 hours of draw. Send 3 mL of serum refrigerate in a plastic vial.

Method Name

Immunoassay; Ex Vivo Challenge; Cell Culture and Histamine Analysis

Reporting Name

CU (Chronic Urticaria) Index Panel

Specimen Type


Specimen Minimum Volume

1 mL

Specimen Stability Information

Specimen Type Temperature Time Special Container
Serum Refrigerated (preferred) 7 days
  Frozen  7 days
  Ambient  5 days

Reference Values

Anti-Thyroid Peroxidase IgG:     <35 IU/mL

Anti-Thyroglobulin IgG:             <40 IU/mL

TSH (Thyrotropin):                    0.4-4.0 uIU/mL

CU Index:                                 <10.0


The CU Index test is the second generation Functional Anti-FceR test. Patients with a CU Index greater than or equal to 10 have basophil reactive factors in their serum which supports and autoimmune basis for disease. 

Day(s) Performed

Monday, Wednesday, Friday

Report Available

2 to 9 days

Performing Laboratory

Eurofins Viracor

Test Classification

This test was developed and its performance characteristics determined by Viracor Eurofins. It has not been cleared or approved by the U.S. Food and Drug Administration.

CPT Code Information





LOINC Code Information

Test ID Test Order Name Order LOINC Value
FCUIP CU (Chronic Urticaria) Index Panel 69040-4


Result ID Test Result Name Result LOINC Value
Z3144 Anti-Thyroid Peroxidase IgG 18332-7
Z3145 Anti-Thyroglobulin IgG 56635-6
Z3146 TSH (Thyrotropin) 3016-3
Z3147 CU Index 63369-3